As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C15 CHECK, DISCOVERED CORROSION ON LEFT OUTBOARD VERTICAL STABILIZER ATTACH BOLT. NO CORROSION LIMITS ARE AVAILABLE FOR BOLT. MAINTENANCE REMOVED AND REPLACED THE LT OUTBOARD VERTICAL STABILZER ATTACH BOLT IAW BOEING 737-300 AMM 55-30-00-4.